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EP0261407A3 - Method and device for the automatic focussing in a photographic enlarging or copying apparatus with a variable enlargement scale - Google Patents

Method and device for the automatic focussing in a photographic enlarging or copying apparatus with a variable enlargement scale Download PDF

Info

Publication number
EP0261407A3
EP0261407A3 EP87112142A EP87112142A EP0261407A3 EP 0261407 A3 EP0261407 A3 EP 0261407A3 EP 87112142 A EP87112142 A EP 87112142A EP 87112142 A EP87112142 A EP 87112142A EP 0261407 A3 EP0261407 A3 EP 0261407A3
Authority
EP
European Patent Office
Prior art keywords
copying apparatus
enlargement scale
focus
automatic focussing
enlargement ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87112142A
Other languages
German (de)
Other versions
EP0261407A2 (en
EP0261407B1 (en
Inventor
Verner Delueg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Durst Phototechnik GmbH
Original Assignee
Durst Phototechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Durst Phototechnik GmbH filed Critical Durst Phototechnik GmbH
Priority to AT87112142T priority Critical patent/ATE89675T1/en
Publication of EP0261407A2 publication Critical patent/EP0261407A2/en
Publication of EP0261407A3 publication Critical patent/EP0261407A3/en
Application granted granted Critical
Publication of EP0261407B1 publication Critical patent/EP0261407B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/34—Means for automatic focusing therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)
  • Projection-Type Copiers In General (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

The focus adjustment appts. uses a calibration phase to obtain a number of focus positions for each enlargement ratio. These are stored so that any intermediate focus position for a different enlargement ratio can be obtained using interpolation. The position values are supplied to the store via position sensors attached to the clamp for the photographic negative and the focussing objective. The stored position values are subsequently accessed via a microprocessor for calculating the intermediate focus positions. The processor pref. uses a higher order interpolation function to provide focus adjustment signals to an automatic positioning control.
EP87112142A 1986-08-29 1987-08-21 Method and device for the automatic focussing in a photographic enlarging or copying apparatus with a variable enlargement scale Expired - Lifetime EP0261407B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112142T ATE89675T1 (en) 1986-08-29 1987-08-21 METHOD AND APPARATUS FOR AUTOMATIC FOCUSING IN A PHOTOGRAPHIC ENLARGER OR COPIER OF VARIABLE MAGNIFICATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT04840/86A IT1201628B (en) 1986-08-29 1986-08-29 PROCEDURE AND DEVICE FOR AUTOMATIC FOCUSING IN A MAGNIFYER OR PHOTOGRAPHIC REPRODUCER WITH VARIABLE MAGNIFICATION
IT484086 1986-08-29

Publications (3)

Publication Number Publication Date
EP0261407A2 EP0261407A2 (en) 1988-03-30
EP0261407A3 true EP0261407A3 (en) 1989-07-12
EP0261407B1 EP0261407B1 (en) 1993-05-19

Family

ID=11114786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112142A Expired - Lifetime EP0261407B1 (en) 1986-08-29 1987-08-21 Method and device for the automatic focussing in a photographic enlarging or copying apparatus with a variable enlargement scale

Country Status (6)

Country Link
US (1) US4806988A (en)
EP (1) EP0261407B1 (en)
JP (1) JP2664688B2 (en)
AT (1) ATE89675T1 (en)
DE (1) DE3785902D1 (en)
IT (1) IT1201628B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0766148B2 (en) * 1987-07-10 1995-07-19 富士写真フイルム株式会社 How to focus the printer
US4937620A (en) * 1988-02-05 1990-06-26 Fuji Photo Film Co., Ltd. Method of focusing printer
DE3912737C2 (en) * 1989-04-19 2001-06-28 Truetzschler Gmbh & Co Kg Securing device for the openable parts of protective covers in textile machines, in particular spinning preparation machines
JPH03196034A (en) * 1989-12-26 1991-08-27 Minolta Camera Co Ltd Automatic magnification setting device for zoom lens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1772304A1 (en) * 1968-03-07 1971-03-04 Durst Ag Device for the automatic focusing of an image to be displayed on a projection plane by means of an objective of a template to be arranged in a template window
US4281927A (en) * 1979-08-27 1981-08-04 Louis Dzuban Apparatus for indicating maximum resolution for projected images
DE3301483A1 (en) * 1982-01-21 1983-07-28 Rudolf 9403 Goldach Böhme Enlarging device having continuous focusing in conjunction with variation of the image size by means of a lens controlled via a bridge circuit and an amplifier
US4488804A (en) * 1980-02-25 1984-12-18 Dainippon Screen Seizo Kabushiki Kaisha Method and machine for automatic focusing in a projection system with continuously variable magnification

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225416A1 (en) * 1972-05-25 1973-12-06 Boeger Duplomat Apparate Kg Dr PROCEDURE FOR SETTING UP A REPRO CAMERA
JPS5397418A (en) * 1977-02-07 1978-08-25 Dainippon Screen Mfg Method of copying machine camera*s automatic focusing and its equipment
JPS6029100B2 (en) * 1980-08-27 1985-07-09 富士写真フイルム株式会社 Method for detecting initial position of easel and lens in photographic equipment
JPS5950433A (en) * 1982-09-16 1984-03-23 Minolta Camera Co Ltd Auto-focusing device of enlarger
DE3339960A1 (en) * 1983-11-04 1985-05-15 Agfa-Gevaert Ag, 5090 Leverkusen PHOTOGRAPHIC COPIER
DE3339991A1 (en) * 1983-11-04 1985-05-15 Agfa-Gevaert Ag, 5090 Leverkusen PHOTOGRAPHIC ROLL COPIER

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1772304A1 (en) * 1968-03-07 1971-03-04 Durst Ag Device for the automatic focusing of an image to be displayed on a projection plane by means of an objective of a template to be arranged in a template window
US4281927A (en) * 1979-08-27 1981-08-04 Louis Dzuban Apparatus for indicating maximum resolution for projected images
US4488804A (en) * 1980-02-25 1984-12-18 Dainippon Screen Seizo Kabushiki Kaisha Method and machine for automatic focusing in a projection system with continuously variable magnification
DE3301483A1 (en) * 1982-01-21 1983-07-28 Rudolf 9403 Goldach Böhme Enlarging device having continuous focusing in conjunction with variation of the image size by means of a lens controlled via a bridge circuit and an amplifier

Also Published As

Publication number Publication date
JP2664688B2 (en) 1997-10-15
US4806988A (en) 1989-02-21
JPS63218933A (en) 1988-09-12
IT1201628B (en) 1989-02-02
ATE89675T1 (en) 1993-06-15
IT8604840A0 (en) 1986-08-29
DE3785902D1 (en) 1993-06-24
EP0261407A2 (en) 1988-03-30
EP0261407B1 (en) 1993-05-19

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